If you are worried about the bass extension, the Absolute Zero is not the speaker for you, unless you are going to buy a sub.Well, how musical they will sound is very much a personal thing. Kind of hard for someone else to say what will suit you when speakers are both good speakers.
I can't really tell what it is because the picture is at an angle, the text labels are obscured, and the picture does not show the whole back of the unit. One good (big) picture of the back, instead of as some part of art collage, would help a lot.
If you are moving the JBL L830 to surround speaker duty, you could go with a different brand for the front three. Get the best value you can for your money.
What is your overall budget for your upgrade?
How much smaller? The V5.1s would be smaller, and would be an excellent match to the V5.2c. The important thing is to stay with the Energy Veritas line as mixing in other speakers in your front soundstage would be a poor timbre match.